JP3998086B2 - Support structure for vehicle transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for supporting a transmission between a pair of side members of a chassis frame of a vehicle.
[0002]
[Prior art]
As shown in FIG. 3, a transmission 3 is attached to a leaf spring 2 installed between a pair of left and right side members 1 extending in the vehicle front-rear direction of a chassis frame of the vehicle via a bracket 8 fixed on the upper surface thereof. The two bolts 9a and 9b are fastened and supported, and the transmission 3 is supported between the pair of side members 1 to improve the mountability of other parts on the upper surface of the side member and to suppress displacement due to suspension bound and rebound. Such a transmission support structure for a vehicle is disclosed in, for example, Japanese Patent Laid-Open No. 9-18849. In FIG. 3, reference numeral 6 denotes a spacer.
[0003]
[Problems to be solved by the invention]
In the above conventional structure, the transmission 3 is supported on the leaf spring 2 by two-point support using two bolts 9a and 9b. As shown in FIG. 4, the leaf spring 2 is greatly deformed between the two point shafts by the two point support as shown in FIG. Due to the large deformation amount of the leaf spring 2, there is a possibility that stress is concentrated on the bolts 9a and 9b and a large load is applied.
[0004]
An object of the present invention is to provide a support structure for a transmission of a vehicle in which stress concentration on a bolt that supports the transmission is reduced between a pair of side members.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a top surface of a leaf spring constructed between a pair of left and right side members extending in the vehicle front-rear direction of a chassis frame of the vehicle, and a mount bracket having upper and lower surfaces sandwiched by elastic bodies. The leaf spring and the mount bracket at a substantially central portion between the pair of left and right side members are fastened by a single bolt, and the transmission is supported at one point by the leaf spring. It is characterized by that.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a pair of left and right side members extending in the vehicle front-rear direction of a chassis frame of the vehicle, and 2 denotes a leaf spring installed between the pair of left and right side members 1.
[0007]
In FIGS. 1 and 2, reference numeral 3 denotes a transmission supported by the leaf spring 2. On the upper surface of the transmission 3, a Z-shaped mounting bracket 4 is fixedly mounted with elastic bodies 5 such as rubber on both upper and lower surfaces.
[0008]
The leaf spring 2 and the mount bracket 4 at a substantially central portion between the pair of left and right side members 1 are fastened by a single bolt 7 with a spacer 6 interposed therebetween, and the transmission 3 is supported at one point. is there.
[0009]
Since the present invention has the structure as described above, the transmission 3 is supported at one point by the single bracket 7 and the mount bracket 4 having the elastic body 5 at the center position of the leaf spring 2. Absorbs vibrations on rough roads in the entire 360 ° range centered on bolt 7.
[0010]
Further, since the one-point support by one bolt 7 at the center position of the leaf spring 2 causes the deformation of the leaf spring 2 to be small even when the power line is twisted due to engine start-up or rotational fluctuation, Stress concentration can be reduced.
[0011]
【The invention's effect】
As described above, according to the present invention, the transmission is supported by one bolt via the mount bracket having the elastic body at the center position of the leaf spring between the pair of side members of the chassis frame of the vehicle. From the above, it absorbs engine vibration and vibration during rough roads in the entire 360 ° range centered on the bolt, and reduces the amount of deformation of the leaf spring due to twisting of the power line due to engine start-up and rotational fluctuations, This has the advantage of improving the supportability of the transmission by reducing the stress concentration on the bolt. Moreover, since the number of supporting bolts is halved, the number of parts and the number of assembling steps can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing a support structure for a transmission of a vehicle according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 4 is a diagram showing a malfunction of a conventional support structure for a vehicle transmission.
1 Side member 2 Leaf spring 3 Transmission 4 Mount bracket 5 Elastic body 6 Spacer 7 Bolt

Claims (1)

A leaf spring installed between a pair of left and right side members extending in the vehicle front-rear direction of the vehicle chassis frame, and a transmission having a mounting bracket with upper and lower surfaces sandwiched by elastic bodies fixed on the upper surface, A transmission of a vehicle characterized in that the leaf spring and the mount bracket at a substantially central portion between a pair of left and right side members are fastened by a single bolt and the transmission is supported by the leaf spring at one point. Support structure.

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